Abstract
Tunable mid-infrared radiation was generated by difference-frequency generation in MgO-doped periodically poled LiNbO3 crystal by mixing of dual-wavelength pulses emitting from a Ti:sapphire laser, which was tuned with an intracavity acousto-optic tunable filter. A tuning range from 3.6 to 5.6 µm was obtained without any mechanical rotation of the nonlinear optical crystal and other laser elements.
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